heh... evolution!!

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Across
  1. 2. gradually change over time
  2. 3. the study of the distribution of plants, animals, and other types of life
  3. 7. the fact or process where a species is no longer existing
  4. 8. a structure that was once functional in an organism's ancestors but has lost its primary function over time through evolution
  5. 9. the condition of being physically fit and healthy.
  6. 10. a group of organisms that can naturally interbreed and produce fertile offspring
Down
  1. 1. where one extreme trait becomes more common in a population because it's better suited for the environment
  2. 4. become adjusted to new conditions.
  3. 5. a permanent change in the DNA sequence of a cell
  4. 6. all the individuals of a particular species living in a specific area
  5. 8. a change or difference in condition, amount, or level, typically with certain limits.